If the 55% in control doesn't want the other 45% to have those, then thats a problem with the society -that shows severe segregation.No, it's a problem with the state. The state is not the society.
We are in the best time to implement true democracy.
No, we are not. No one knows what it even is.
Are the red and blue candidates your only choice?
That's a majoritarian consideration. Eliminating that for the U.S. is only one of many issues.
Is it so hard to implement a better way to field candidates based on merits/goods
Yes, it is extraordinarily hard. As a practical matter, any system based on electing representatives makes it impossible to ex ante anticipate the decision making that the representative will actually undertake in office. There is no guarantee that the elected agent will abide by the expectations that they have conveyed to the principal. Further, decision making in a system of collective action has profoundly different semantic considerations and rules from that of a contractual exchange.
(This topic has been well-studied under constitutional economics, voting theory, rational choice and political science. For starting points, see The Logic of Collective Action and The Calculus of Consent followed by Patterns of Democracy. For radical reappraisals, see Organization Theory (Kevin A. Carson) and Democracy: The God That Failed).